Sushi made with deer meat, anyone? How about a slice of raw horse on that rice?

These are some of the most extreme alternatives being considered by Japanese chefs as shortages of tuna threaten to remove it from Japan’s sushi menus — something as unthinkable here as baseball without hot dogs or Texas without barbecue.

In this seafood-crazed country, tuna is king. From maguro to otoro, the Japanese seem to have almost as many words for tuna and its edible parts as the French have names for cheese. So when global fishing bodies recently began lowering the limits on catches in the world’s rapidly depleting tuna fisheries, Japan fell into a national panic.